Valuation and Qualifying Accounts and Reserves - Valuation Allowance for Deferred Tax Assets (Details) (Valuation Allowance of Deferred Tax Assets [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Valuation Allowance of Deferred Tax Assets [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Beginning Balance	$ (668)	$ (159)	$ 0
Charged to Costs and Expenses	(237)	(509)	(159)
Reversals	0	0	0
Utilizations	0	0	0
Ending Balance	$ (905)	$ (668)	$ (159)